The only number less than 100 with exactly nine factors is 36. 19 is not one of the factors.
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19 is already prime; no need for a tree.
26 greatest factor is itself, 19 is a prime number so it is 19...they dont have a same common factor but 26 x 19 is 494...
3 isn't a factor of either number.
The greatest common factor (GCF) of two numbers is the largest number that divides both numbers without leaving a remainder. In this case, the numbers 19 and 38 have a GCF of 19. This is because 19 is a prime number and the only common factor of 19 and 38. Therefore, the GCF of 19 and 38 is 19.
3 and 19